Space Policy Directive-3 lays out general guidelines for the United States to mitigate the effects of space debris and track and manage traffic in space.

《空间政策指令3》为美国制定了一般性指南，以减轻空间碎片的影响以及跟踪和管理太空交通。

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Use the entrants log sheet to keep track of personnel entering and leaving confined space. 

使用进入者日志表来跟踪人员进入并留出有限的空间。

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That means programmers have to keep track or recompute how much space is left all the time.

这意味着程序员必须始终跟踪或重新计算剩余的空间。

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They came away unpersuaded of the space-track rationalization for this radar.

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The song's reverb-doused psychedelia offers a space-rock feel that reaches its apex during the track's huge, two-minute wall-of-sound finish.

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The record is an 11-track foray into theatrical, space-themed chamber pop that falls somewhere between the score of a Broadway musical and a collection of sweet and playful nursery rhymes.

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